As I notice the varying tastes in music around this site, there seems to be a lot of people who enjoy rap and/or hip-hop. So this is your place to present your favorite MCs. Old-school, newer artists, it doesn't matter. Just give them.
For me (in no particular order):
4.) Slick Rick
5.) Big Pun
6.) CL Smooth
8.) Black Thought
9.) Chali 2na
This also tends to change from day to day and I didn't include groups (such as A Tribe Called Quest, De La Soul, and The Pharcyde). Have at it.